1、- MIL-C-23742 bL 7777706 0088931 8 MIL4 -23742(SHLPS) 12 July 1963 MILITARY SPECIFICATION CONTROL CENTERS, ALTERNATING CURRENT NAVAL SHIPBOARD 1. SCOPE 1.1 This specification covers High Impact (HI) shockproof group control and distribution sections for Naval shipboard use, 2. APPLICABLE DOCUMENTS 2
2、,l The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent specified herein. SPECIFICATIONS FEDER4L QQ-C-504 - Copper Bus Bars (Including Bars, Rods and Shapes). MILITARY MIL-S-901 MIL-E-917 MIL-D-963 MIL-C
3、-2212 MIL-Q-9858 MIL-M-15071 - Manuals, Equipment and Systems, MIL-F-15160 - Fuses; Instrument, Power and Telephone. MIL-W-16878 - Wire, Electrical, Insulated, High Temperature. MIL-C-17361 - Circuit Breakers, Air, Electric, Insulated Enclosure, (Shipboard Use). MIL-F-19207 - Fuseholder, Extractor P
4、ost Type, Blown Fuse Indicating and Nonindicating. MIL-R-19523 - Relays, Auxiliary, Naval Shipboard. MIL-E-22843 - Equipment, Low Noise Level, (Naval Shipboard Use). - Shock Tests, H. I. (High-Impact); Shipboard Machinery, Equipment and Systems, - Electric Power Equipment, Basic Requirements for (Na
5、val Shipboard Use). - Drawings, Electrical, Hull and Mechanical Equipment for Naval Shipboard Use. - Controllers, Alternating Current, Naval Shipboard. - Quality Control System Requirements. Requirements for , STANDARDS MILITARY MIL-STD-167 - Mechanical Vibrations of Shipboard Equipment. MIL-STD-195
6、 - Marking of Connections for Electric Assemblies. MIL-STD-740 - Noise Measurements of Shipboard Machinery and Equipment. DRAWINGS BUREAU OF SHIPS 815-1853024 9000-S6202-74230 - Fuseholder, Single, Dead Front-Blown Fuse Indicating for 1-1/2 x 13/32 - Dead Front Fuseholder, Type FHL14G. Inch Fuses, T
7、ype 12FH1, 450 Volts. (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contract- ing officer.) 2.2 Other publications.- The following documents
8、 form a part of this specification to the extent speci- fied herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-Z3742 bL W
9、99999Ob 0088932 T MIL-C-23742(SHIPS) OFFICIAL CLASSIFICATION COMMITTEE Uniform Freight Classification Rules. (Application for copies should be addressed to the Official Classification Committee, 1 Park Avenue at NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) 33rd Street, New York 16, New York)
10、, IC1 - Control, Industrial. (Application for copies should be addressed to the National Electrical Manufacturers Association, 155 East 44th Street, New York 17, New York). (Technical society and technical association specifications and standards are generally available for reference from libraries,
11、 They are also distributed among technical groups and using Federal agencies.) 3. REQUIREMENTS 3.1 Preproduction sample.- Prior to beginning production a sample of one control center shall be tested as specified in 4.2 (see 6.2). 3.2 Definitions.- The following definitions apply to terms used in thi
12、s specification: 3.2.1 Group control section.- A self-supporting, vertical structure containing controller units for the 3.2.2 Distribution section.- A self-supporting, vertical structure containing AQB circuit breakers, in 3.2.3 Group control and distribution section.- A section which contains cont
13、roller units and separately 3.2.4 Controlcenter.- Distribution and group control sections, or a combination thereof, serving as a 3.2.5 Controller unit.- An assembly consisting of a magnetic controller and protective devices suitable 3.3 General requirements.- The equipment shall conform to MIL-E-91
14、7 and MIL-C-2212. Whenever a supply and control of power to electrical auxiliaries. number asKimbution of power to miscellaneous ship service loads. mounted AQB circuit breakers for distribution of power to miscellaneous ship service loads. power distribution center for a selected system or distribu
15、tion area. for drawout mounting in a group control section or group control and distribution section. requirement of MIL-E-917 and MIL-C-2212 conflicts with a requirement of this specification, the require- ments of this specification shall govern, 3.4 Design,- 3.4.1 Group control and distribution s
16、ections.- A section shall be a vertical structure of a maximum height of 82 inches over the dpipshield, 20 inches wide and 12 inches deep. Controller units shall it over a space of either 12-1/2 inches or 25 inches in height. Individually mounted circuit breakers shall fit into a space of 12-1/2 inc
17、hes in height for 100 ampere units and 14 inches for 250 ampere units. Each section shall be provided with horizontal wiring space at the bottom, unless otherwise specified (see 6.1), which will line up with adjacent sections to form a convenient raceway the entire length of the load center. In addi
18、tion, each section shall have a vertical wire space either in the rear or on one side for unit wiring. The vertical wiring space shall be equipped with sufficient cable tie supports to hold cables and wiring in place. 3.4.2 Conpoller units.- Units shall be provided in accordance with the following s
19、tandards, as specified (see 6.1): Unit type A Twin size O B Single size 1 C Twin size 1 D Single size 2 E Single size 3 Description with fuses 5HP max. with fuses 1OHP max. with fuses 10HP max. with 100 amp. breaker 25HP max. with 100 amp. breaker 50HP Max. 2 Provided by IHSNot for ResaleNo reproduc
20、tion or networking permitted without license from IHS-,-,-MIL-C -23742 (SHIPS) Unit type F Single size 4 G Single size 4 H Single size 5 A2 Two size O B2 Two size 1 c2 Two size 2 Description with 100 amp. breaker 75HP max. with 250 amp. breaker 1OOHP max. with 250 amp. breaker 200HP max. with contro
21、l and line fuses for two with control and line fuses for two with control fuses for two speed, speed, 5HP max. speed, 1OHP max. 25HP max. Controller units of the same size and design shall be readily interchangeable. 3.4.3 Terminal boards.- If required by the contract or order, all control and power
22、 circuits shall be brought to terminal boards located horizontal in the wiring space at the bottom of the section unless otherwise specified (see 6.1). Provision shall be made for approximately 10 percent spare terminals on the board. Access to the terminal boards shall be from the front, To minimiz
23、e the possibility of breakage of the ter- minal boards, due to distortion of the mounting support under shock, the length of the terminal board shall not exceed 12 terminal points. fuses for size O and size 1 controllers shall be style F60 or F62 in accordance with MIL-F-15160. 3.4.4 Fuses.- Fuses f
24、or control circuis shall be style F60 in accordance with MIL-F-15160. Line 3.4.4.1 Fuseho1ders.- Fuseholders for control fuses shall be type 12FHl(FHL12G) 0-30 amp, 500 volt, deadfront,%blown fuse indicating fuseholders in accordance with Drawing 9000-S6202-74230 and MIL-F-19207. The fuseholders sha
25、ll be mounted with the megger test holes on the bottom, line side on top and load side on the bottom. Fuseholders for line fuses for size O and size 1 controllers shall be type FHLldG, or meet the above requirements or the requirements of MIL-E-917 and MIL-S-901. 3.4.5 Circuit breakers,- Circuit bre
26、akers shall conform to MIL-C-17361 and shall be 500 volt, 60 cycle, 3 phase, fused type AQBLF, AQB with associated current limiting fuses, or unfused type AQB, as specified (see 6.1). Breakers shall have ratings and instantaneous trip settings as required. Circuit breakers in con- troller units may
27、be of the front connecting type, Breakers for distribution sections shall be of the removable mounting type, with connections being made by use of mounting blocks in accordance with MIL-C-17361. Mounting of breakers in the distribution sections shall be arranged so that the rear terminals of the mou
28、nting blocks will be accessible from the front after the breakers are removed. Fuses for the breakers shall be replaceable from the front without opening the group control or distribution unit door. Guards shall be pro- vided, on the outside of the unit doors, for the breaker handles to prevent acci
29、dental tripping of the breakers. 3.4.6 Relays.- Relays shall conform to MIL-C-2212 or Category A, Class I of MIL-R-19523. 3.4.7 Bus work.- The bus work in the rear of the sections may be either copper bus bar or adequately braced insulated copper cable. Cable shall conform to the standards of qualit
30、y required by type D of MIL- W-16878. Bus bar shall be hard-temper in accordance with &-C-504, except that minimum radii of round edges shall be approximately one half the bar thickness. The bus work shall be adequately braced for 25,000 amperes short circuit current or as otherwise specified (see 6
31、.1). All contact areas shall be silver surfaced. Bus work for controller sections shall be designed for 600 amperes, 500 volts a.c. continuous duty. Bus work for controller and distribution sections shaI1 be designed for 1000 amperes, 500 volts a.c. continuous duty, Bus work for distribution section
32、s shall be designed for the rating as specified (see 6.1). The interconnecting bus work shall be rated as required to carry the total load of the parallel connecting sections. See table I for bus bar rating. 3.4.7.1 Bus bar insulation.- Unless bus bars are covered by insulation or are inaccessible f
33、rom the front, after units are removed, they shall have two coats of red colored insulating paint. The coating shall have an insulation resistance value of at least 500 volts per mil of thickness. Bus joints or connectors shall not be painted, either before or after assembly. 3.4.8 Arrangement. - Pu
34、shbuttons, indicating lights and fuseholders shall be mounted on small mounting plates in the unit. An opening shall be provided in the unit door to permit the pushbuttons, indicating lights and fuseholders to protrude through the door and shall be of such size that the edges of the opening will ove
35、r- lap the mounting plates when the door is closed. A layer of gasket material, preferably rubber, shall be 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-23742(SHIPS) placed on the door or mounting plates where the overlap occurs to provide
36、 dripproof protection. Auxiliary relays, if required, shall be located in the stationary structure and not be withdrawn with the controller unit (see 6.1). They shall be wired to the terminal boards. The doors shall be arranged so that they can be closed and latched after removal of a unit. Table I
37、- Ampere rating of rectangular bus bars placed on edge. Number of bars in parallel 1 2 (1/4 inch apart) 3 (1/4 inch apart) Size of bars (inches) 3/4 x 1/8 1 x 1/8 1-1/2 x 1/8 2 x 1/8 3/4 x 3/16 1 x 3/16 2 x 3/16 3/4 x 1/4 1 x 1/4 2 x 1/4 3 x 1/4 4 x 1/4 5 x 1/4 6 x 1/4 2 x 1/4 3 x 1/4 4 x 1/4 5 x 1/
38、4 6 x 1/4 3 x 1/4 4 x 1/4 5 x 1/4 6 x 1/4 1-1/2 x 3/16 1-1/2 x 1/4 2-1/2 x 1/4 Cross sectional area, (square inches) 0.094 ,125 .188 .250 ,140 .188 .278 ,375 .188 .250 .375 .500 .625 .750 1.000 1.250 1.500 1.000 1.500 2.000 2.500 3.000 2.250 3.000 3.750 4.500 A. C. ampere rating 60 cycle Copper bus,
39、 silver surface 210 285 425 555 265 355 550 700 295 410 600 780 1,000 1,140 1,425 1,760 2,100 1,350 1,825 2,280 2,740 3,140 2,200 2,660 3,200 3,600 3.4.9 Terminal and wire marking.- 3.4.9.1 External connections,- All terminals for external connections shall be permanently marked in accordance with M
40、IL-STD-195. The marking shall be such that it remains intact and does not interfere with the connection of the incoming leads. The marking shall be visible after the connection is made. 3.4.9.2 Wiring identification.- All internal wiring using wires over 18 inches long and all wires in har- nesses o
41、r bundles shall be permanently marked. The wires shall be marked at each end by stamping the identification on an insulated sleeve which shall be slipped over the wire close to the terminal. The marking shall correspond to that shown on the wiring diagram. 3.4.9.3 Wiring practice.- Circuitous routin
42、g of wiring shall be avoided. Wiring may be neatly formed into bundIes (multiple wires) and laced or secured by sleeving. Wire bundles shall be supported or clamped in a manner which will prevent chafing of the insulation. Fanning strips may be used to position wiring at terminal boards. Wire groups
43、 running from hinged panels shall be provided with slack and shall be formed and clamped so that sharp bends do not occur in either the open or closed position. Gromments shall be pro- vided for protection of insulation where wires are run through holes. Care shall be exercised in the running 4 Prov
44、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL-C-237V2 bL 97997Ob 0088935 5 W MIL-C-23742(SHIPS) of wires to insure that they are not carried over or bent around a sharp corner or edge which might in time abrade the insulation. 3.4.10 .Noise.- If
45、low noise equipment is required, it shall be designed to meet the requirements of MIL- E-22843, The gracie shall be as specified (see 6.1). 3.4.11 Phase rotation.- When facing the front of a section or control center, the phase rotation shall be A, B and C respectively, from right to left, top to bo
46、ttom or front to back. 3.4.12 Silver surfacing of buses.- The contact surfaces of bus bars and main connections shall be silver plated, 3.4.13 Creepage and clearance.- Creepage and clearance distances for all appurtenances shall conform to MIL-E-917. For all other live parts, such as bus work, the v
47、alues shall conform to table II. Table II - Creepage and clearance for bus bar. Voltage 115 a.c. 440 a.c. In air Insulation distances to ground or to opposite polarity Inches 1/2 25/32 Surface creepage _ Bottom and side surfaces Topf lat surfacesu Inches 15/16 1-9/16 Inches 1-1/8 2 !/Values for top
48、creepage apply to flat surfaces or to curved surfaces presenting sufficient irregularities to permit accumulation of dust and moisture. Values are not intended to apply to simple cylindrical surfaces having a radius of 3 inches or less where side creep- age values will apply. 3.5 nc1osures.- Enclosu
49、res for control centers shall conform to the dripproof requirements of NEMA Standard IC1 when inclined to 45 degrees from normal position and be dead-front, deck mounted with provision for sway bracing from the top. 3.5.1 General.- The sections shall be composed of stacks of vertically arranged controller units or breaker units mounted together in such an integral framework to form a free-standing structure. The frame- work of the enclosure of each section shall be fabricated from steel angles, chan
